bug 140204:HTTP preferences have weird checkbox handling

r=bzbarsky sr=darin
Check in for Antonio Xu's(antonit.xu@sun.com) fix

xpfe/components/prefwindow/resources/content/pref-http.js

@@ -46,8 +46,6 @@ function checkPipelining()
 
     var doDisable = !(enableHTTP11.selected && enableKeepAlive.checked);
     enablePipelining.disabled = doDisable;
-    if (doDisable)
-      enablePipelining.checked = false;
   } catch(e) {}
 }
 
@@ -60,8 +58,6 @@ function checkPipeliningProxy()
 
     var doDisable = !(enableHTTP11.selected && enableKeepAlive.checked);
     enablePipelining.disabled = doDisable;
-    if (doDisable)
-      enablePipelining.checked = false;
   } catch(e) {}
 }